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High-resolution true color aerial imagery was collected for use as a raster base image for coastal mapping projects and the development of new raster and vector data sets in support of mapping eelgrass on the coast of Maine. |
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High-resolution true color aerial imagery was collected for use as a raster base image for coastal mapping projects and the development of new raster and vector data sets in support of mapping eelgrass on the coast of Maine. |
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Orthophotos were produced for the State of Maine Department of Enviromental Protection. James W. Sewall and Normandeau Associates were primary contractors and Bluesky Geospatial was subcontracted for aerial imagery acquisition. |
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18018.5223850094 |
| typeKeywords:
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["Data","Service","Image Service","ArcGIS Server"] |
| description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>This dataset consists of true color aerial imagery of the Pisctaqua coastal region between York, ME and Cape Elizabeth, ME and was captured at 14.5-cm GSD and used to produce high resolution 6” orthorectified imagery with a one-foot accuracy. Imagery was collected on June 28th and 29th, 2021, during low tide conditions and within two hours of spring tides. Additional atmospheric considerations that were considered before each lift included flying in a sun angle between 25 degrees and 50 degrees, no more than 10% cloud cover, and less than 10 knots of a maximum predicted wind velocity. Additionally, flights were only be dispatched after a precipitation-free period of at least 48 hours. The project area consisted of approximately 400 images on approximately 7 flight lines with 60% forelap and 30% sidelap. Airborne GPS and IMU were be utilized during the acquisition to improve the aerotriangulation solution. Raw imagery was acquired using the Vexcel Eagle 80-mm Mark 3 mounted on a fixed wing aircraft and flown at an elevation of approximately 9,500 feet. Digital ortho-rectified imagery was created using the raw digital aerial imagery, ground control, aerotriangulation, and a digital elevation model. Existing State of Maine ground control was utilized in the aerotriangulation solution for this project. These aerial survey products were under contract for the State of Maine Department of Environmental Protection. Bluesky Geospatial captured the raw aerial imagery and James W. Sewall processed the raw imagery to develop the aerotriangulation solution and to create digital orthophotos and related products. Normandeau Associates served as Aerial Survey Coordinator to verify that project specifications were met.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>The State of Maine Department of Environmental Protection (DEP) makes this information available to enhance public knowledge and promote education. The State of Maine DEP also retains the right to make changes to the data without prior notice. Neither the State of Maine DEP, nor any of its employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, nor represent that its use would not infringe on privately owned rights. The data are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete, and it should not be used for navigational purposes. The State of Maine DEP assumes no liability, any damages or loss of any kind that might arise from the use of, misuse of, or the inability to use these data. The State of Maine DEP assumes no liability for any damages or loss of any kind caused by any errors or omissions in the data. All data are distributed "as is," without warranties of any kind, either express or implied, and subject to the terms and conditions stated in this disclaimer.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV> |
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| title:
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Maine Orthoimagery Coastal South Coast 2021 |
| type:
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Image Service |
| url:
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https://gis.maine.gov/arcgis |
| tags:
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["imageryBaseMapsEarthCover","ortho","orthoimagery","orthophotography","Maine","GeoLibrary","MaineGeoLibrary","MaineDEP","orthoCoastal","Coastal","Low Tide"] |
| culture:
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en-US |
| name:
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orthoCoastalSouthCoast2021 |
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| minScale:
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7.38038676889986E7 |
| spatialReference:
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NAD_1983_UTM_Zone_19N |